Diamond-holder



R. W. UHLIG.

DDDDDDDDDDDD R.

APPLICA ,1919. 1,329,865. v Patented Feb. 3, 1920.

l 1 shows a view of one form of holder having UNITED sTATEs PATENToEEIcE.

ROBERT W. UHLIGr, 0F ST. LOUIS, MISSOURI.

DIAMOND-HOLDER.

To all whom t may concern.'

Be it known that I, ROBERTWV. UHEIG,

a citizen of the United States, residing vin the city of St.' Louis andthe State of Missouri, have invented a new and useful Improvement inDiamond-Holders, of which the following is a full, clear, and exactspecification, reference being had tothe accompanying'drawings, whichform a part thereof.

My invention relates to devices for holding diamonds and similar hardsubstances when they are used in industrial work for the purpose ofcutting orv grinding; and my invention relates particularly to thoseholders for diamonds used for the purpose of dressing or truingemery-wheels or similar grinders.

lHeretofore it has been common to mount the diamonds used for truinggrinding wheels in the cavity of a holder by pouring a matrix in thecavity around the diamond. This matrix is usually at a high temperaturewhen in a liquid condition, and therefore it tends to injure thediamond. It has also been common to mount the diamond in a holder byshrinking around ita body of metal, but this method tends also to crackor otherwise injure the diamond, and hence it is objectionable. --Afurther objection to the lmethods heretofore used lies in the fact thatafter a diamond'has been mounted in its holder it is diiicult to removeit Without.

injuring the stone'when it is desired to remount it or to change theposition of the diamond in the holder.

The object of my invention is to provide a -holder lfor a diamond orsimilar object, which will admit of the diamond'- being easily andquickly mounted therein in suchl a way as to rmly hold the diamond inplace and which will also admit of the diamond being readily removed or.remou-nted.

My invention is fully` shown in the accompanyingl drawings where similarletters are used to designate similaparts. .Figure a diamond mounted init; Fig. 2 is a longitudinal section of the holder in Fig. 1, showingthe internal arrangement of the holder with the diamond in place; Fig.l3 is a view of a form ofv holder embodying my invention; Fi 4 is alongitudinal sectional view of a holder of Fig. 3, lshowing thearrangement ofthe parts with the diamond in place.

Referring to the figures, A vis the body or Specification of LettersPatent.

Application filed August 11, 1919.

. melting point. p pieces of metal, of which the jaws are to be PatentedFeb. 3, 1920. seri-a1 No. 316,710.

handle portion of the holder which has at one end athreaded part B. C isa cap provided with internal threads adapted to en gage the threadsformed on the part B. The diamond Y is held by a holding member whichcomprises the jaws D and E. In Fig. 2` the threaded part B is shown asmade integral with the body A; while in Fig. 4 the threaded part B ismade integral with the jaw E and is screwed into a socket formed in thebody A. The jaws D and E are preferably made of copper or some similarsoft ,metal These jaws are formedby putting together the parts of metalof which they are made and holding them tightly together and then boringa centralopening U, which nr'ay extend 'from end to end as in Fig. 2 oronly a part of the length of the jaws as in Fig. 4. I find it convenientto provide the jaws with afpin G which is fixed in one of the jawsbutwhich is loose in a hole formed in the other jaw; and I also lind itadvisable to solder together the jaws by, preferably, some form ofsolder having a low After, however, the two ormed, have been securedtogether and the central opening U formed, they are then turned vsoas tohave an exterior surface F which is the frustum of a cone. After the Ijaws have been turned so as to give them thedesired conical shape, thesolder or other fastening means is removed so that the jaws are separateand distinct one from the other. The cap C is provided with aninternally formed tapered, cone shaped surface adapted to engage withthe surface F 0f the jaws. The jaw D in Fig. 4 rests on the shoulder Hformed at the base `of the jaw E on the threaded part B, and is thusprevented from being moved axially of the holder, so that when the cap Cis screwed down on B both jaws are forced up into the cap and arethereby clamped together firmly without be- '1s ,av faceted portionwhich may be formed on the lower end lof the cap C in order tolfacilitate screwing the cap in place.

en a diamndis to-be mounted it is placed the central opening U betweenthe hold said diamond jaws l) and E and then the jaws are positioned onthe holder' and the cap C placed It is evident that the size of the jawsandL the taper of their exterior surface may be varied to suit ditterentrequirements without departing from the `spirit of my invenu tion, andthat the method of making the jaws may be different from thathereindescribed when it may be necessary or desirable.

`What I claim as new and desire to secure by Letters Patent, is:

l. A diamond holder comprising a body portion, oppositely disposed jawmembers adapted to be moved to and from each other without movingaxially, each of said jaws being formed of metal into which said diamondcan be embedded by pressure and having adjacent its outer end anexterior tapered surface'and having a centrally disposed grooveextending 'downwardly from said outer end, and a cap adapted to fit oversaid jaw members and having an interior surface adapted to engage withthe tapered surfaces of said jaws whereby'said jaws are forced togetherto hold said diamond embedded in the walls of said grooves.

2. A diamond holder comprising abody portion, oppositely disposed jawmembers adapted to be moved to and from each other without movingaxially, each of said jaws being formed of metal into which saiddiamondcan be embedded. by pressure and having adjacent its outer end anexterior tapered surface and having a centrally disposed grooveextending downwardly from said outer end, a guide pin attached to onejaw member and projecting into a hole formed in the opposite jawlmember, and a cap adapted to t over said aw members to en* gage with thetapered surfaces thereof whereby said jaws are forced together toembedded in the Walls of said grooves.

Y posite jaw member,

'adapted to portion, a cap adapted to it over said jaw members andhaving interior threads adjaeent its inner end adapted to engage withthe threads formed adjacent the outer end of said body portion andhaving adjacent its outer end an interior surface adapted to engage thetapered surfaces of said jawmemberswhereby when said cap is screwed ontosaid body portion said jaws are caused to move toward each other to holdsaid diamond embedded in the walls of said grooves.

4. A diamond holder comprising a body portion having its outer endformed substantially at right angles withthe axis of said body portionand having exterior threads adjacent said outer end, oppositely disposedjaw members formed` of metal into which said diamond can be embedded bypressure, each of said jaw members having a tapered exterior surfaceadjacent its outer end and a cent-rally disposed groove extendingdownwardly from said outer end and said jaw member being disposedwithits inner end resting on the outer end of said body portion, a guide pinattached to one, jaw member and projecting into a hole formed in theopand a cap adapted to fit over. said jaw members and having interiorthreads adjacent its inner end adapted to engage with the threads formedadjacent the outer end of said body portion and having adjacent itsouter end an interior surface engage the tapered surfaces of said jawswhereby when said cap is 'screwed' onto said body portion said jaws arecaused to move toward each other to hold vsaid diamond embedded in theWalls of said grooves.

In Witness whereof I have signed my name to this specification.

ROBERT W. UHLIG.

